diff --git a/pkgs/applications/networking/browsers/firefox/wrapper.nix b/pkgs/applications/networking/browsers/firefox/wrapper.nix
index 123d597031cd..6561e51d7d95 100644
--- a/pkgs/applications/networking/browsers/firefox/wrapper.nix
+++ b/pkgs/applications/networking/browsers/firefox/wrapper.nix
@@ -84,7 +84,7 @@ let
             ++ lib.optional sndioSupport sndio
             ++ lib.optional jackSupport libjack2
             ++ lib.optional smartcardSupport opensc
-            ++ lib.optional (cfg.speechSynthesisSupport or false) speechd
+            ++ lib.optional (cfg.speechSynthesisSupport or true) speechd
             ++ pkcs11Modules
             ++ gtk_modules;
       gtk_modules = [ libcanberra-gtk3 ];